Survey of recent applications of reactor noise techniques at Argonne National Laboratory Page: 3 of 43
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tron lifetimes in the core and reflector produce deviations from point
kinetics in the range of the break frequency. Various two-detector mid-
frequency polarity coherence function methods have produced good reactivity
estimates, although these methods depend on near-critical reference measure-
ments and are perturbed by differences in detector efficiency between the
reference and measured systems. Correction methods to account for detector
efficiency and neff changes have been developed.
The accuracy of fast critical experiment measurements of Ak/k are directly
affected by the accuracy with which seff is known. Recent conflicting experi-
mental data on si, A. has been the incentive for use of a noise-based integral
neff measurement technique. The technique is a modified detector noise
variance-to-mean method using sampling intervals from 8 to 200 sec; seff has
been measured to a precision of 2.9% in the FTR mockup critical assembly.
Exploratory work on the use of neutron/acoustic noise cross correlation
as a tool for surveillance of fast power reactor systems has been carried out
using the Experimental Breeder Reactor II. Cross correlation of neutron
signals from in-core detectors with acoustic signals from accelerometers
mounted on various mechanical components connected into the core structure
has been studied up to several thousand hertz. Flow-induced subassembly vibra-
tions at about 10 hertz have been observed.
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Lewis, R.A.; Bennett, E.F.; Carpenter, S.G.; Cohn, C.E. & Price, C.C. Survey of recent applications of reactor noise techniques at Argonne National Laboratory, article, September 20, 1974; Illinois. (digital.library.unt.edu/ark:/67531/metadc1019413/m1/3/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.